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Descriptive statistics of the pre- and poststudy test scores.
| Data sources | Dimension of measurement | Question feedback | Sample size | Average value | Standard deviation |
| Questionnaire | Pre-testing | No feedback | 30 | 7.57 | 1.77 |
| Simple feedback | 30 | 7.47 | 1.81 | ||
| Elaborated feedback | 31 | 7.58 | 2.03 | ||
| Post-test | No feedback | 30 | 8.77 | 2.33 | |
| Simple feedback | 30 | 10.03 | 2.04 | ||
| Elaborated feedback | 31 | 11.23 | 1.84 |
